Other
Official Site of Rick Riordan: Teacher's Guides
Lots of downloadable teacher guides to accompany Rick Riordan's books.
Other
Read Riordan: Official Web Page
This is the official site for Rick Riordan which offers articles and quizzes about his books including Percy Jackson and the Olympians and Magnus Chase and the Gods of Asgard.
Ducksters
Ducksters: Kids Books Authors: Rick Riordan
Read about Rick Riordan's biography the author of children's books such as The Lightning Thief with Percy Jackson on this website.